CAROL AND MIKE WERNER / SCIENCE PHOTO LIBRARY CAROL AND MIKE WERNER / SCIENCE PHOTO LIBRARY
Illustration of the body responding to a skin puncture. Inflammatory response. Damaged tissue releases histamines into the area, causing blood vessels (foreground) to become porous. Phagocytes move through the capillary walls to attack bacteria and clean up cellular debris. Platelets move to the wound to cause blood clotting.
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